Sonatina I is an arrangement of the 2nd and 3rd mvts. of Quartet for 2 violins, viola, cello, B.307.Sonatina II is an arrangement of the 2nd mvt. of Symphony in D major, B.126, and the final mvt. of Quartet for violin, 2 violas, and cello in E♭ major, B.352.Sonatina III is an arrangement of the 2nd mvt. of Quartets in C for 2 violins, viola, and cello, B.351, and the 3rd mvt. of Symphony in B♭ major, B.127.